expose parentContainer to templates

[mitchnull]

Description

I'm extending the models generated from swaggers with a deepCopy() method for java. For this I need to generate code based on the property types, but in case the basetype is List or Map, the detailed type information is lost to the templates.

I propose exposing the "parentContainer" type in these cases similar to how "items" are exposed for container properties.

The proof-of-concept code is ready, I'll file a PR soon.

Swagger-codegen version

2.4.10, 2.4.11-SNAPSHOT (HEAD)

Swagger declaration file content or url

swagger: "2.0"
info:
  version: "1.0.0"
  title: "test"

paths: {}

definitions:
  ArrType:
    type: array
    items:
      type: string
      format: date-time

Command line used for generation

java -jar ~/.m2/repository/io/swagger/swagger-codegen-cli/2.4.10/swagger-codegen-cli-2.4.10.jar generate -i testarr.yaml -l java -o /tmp/test -DdebugModels=true > logarr-orig.txt

java -jar ~/src/swagger-codegen/modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i testarr.yaml -l java -o /tmp/test -DdebugModels=true > logarr.txt

Steps to reproduce

N/A

Related issues/PRs

The PR will include the fix for #9918

Suggest a fix/enhancement

will file a PR

logarr-orig.txt
logarr.txt